IDEAYA Biosciences, Inc. (IDYA) Insider Ownership

Historic Insider Ownership Trends

IDYA's three largest insider shareholders as of March 23, 2026 are Yujiro S Hata (President And Ceo, 690.70K shares), Michael P. Dillon (Svp, Chief Scientific Officer, 78.79K shares), Jason Throne (Chief Legal Officer, 63.48K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Yujiro S Hata President And Ceo 690,695 0 19 Feb, 2025
Michael P. Dillon Svp, Chief Scientific Officer 78,789 0 06 Oct, 2021
Jason Throne Chief Legal Officer 63,484 0 27 Jun, 2024
Jeffrey Stein 54,281 0 02 Mar, 2026
Briseno Andres Ruiz See Remarks 26,466 0 02 Feb, 2026
Paul A. Stone Chief Financial Officer 9,303 0 31 Aug, 2023
Douglas B. Snyder Svp, General Counsel 2,080 0 02 Feb, 2026

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
02 Mar, 2026 Jeffrey Stein Common Stock A 50,000 $32.96 54,281 D P
30 Jan, 2026 Joshua Bleharski Stock Option (right to buy) A 170,000 $0.00 170,000 D A
30 Jan, 2026 Yujiro S Hata Stock Option (right to buy) A 600,000 $0.00 600,000 D A
29 Nov, 2024 Briseno Andres Ruiz Common Stock A 682 $23.26 25,213 D A
30 May, 2025 Douglas B. Snyder Common Stock A 1,039 $16.91 1,039 D A
30 Jan, 2026 Michael Anthony White Stock Option (right to buy) A 190,000 $0.00 190,000 D A
30 Jan, 2026 Stuart Dorman Stock Option (right to buy) A 155,000 $0.00 155,000 D A
30 Jan, 2026 Darrin Beaupre Stock Option (right to buy) A 175,000 $0.00 175,000 D A
28 Nov, 2025 Douglas B. Snyder Common Stock A 1,041 $16.91 2,080 D A
28 Nov, 2025 Briseno Andres Ruiz Common Stock A 1,253 $16.91 26,466 D A
30 Jan, 2026 Douglas B. Snyder Stock Option (right to buy) A 130,000 $0.00 130,000 D A
30 Jan, 2026 Briseno Andres Ruiz Stock Option (right to buy) A 80,000 $0.00 80,000 D A
24 Jun, 2025 Scott W Morrison Stock Option (right to buy) A 20,000 $0.00 20,000 D A
24 Jun, 2025 Catherine J Mackey Stock Option (right to buy) A 20,000 $0.00 20,000 D A
24 Jun, 2025 Malcolm Garret Hampton Stock Option (right to buy) A 20,000 $0.00 20,000 D A
24 Jun, 2025 Wendy L Yarno Stock Option (right to buy) A 20,000 $0.00 20,000 D A
24 Jun, 2025 Terry J Rosen Stock Option (right to buy) A 20,000 $0.00 20,000 D A
24 Jun, 2025 Jeffrey Stein Stock Option (right to buy) A 20,000 $0.00 20,000 D A
27 Feb, 2025 Stuart Dorman Stock Option (right to buy) A 15,000 $0.00 15,000 D A
27 Feb, 2025 Darrin Beaupre Stock Option (right to buy) A 185,000 $0.00 185,000 D A